Chu was replying to a tweet Trump sent earlier Wednesday, marking the first anniversary of him winning the 2016 election. She was also referring to all Twitter users now being able to use 280 characters in tweets, double the original character limit.

“Congratulations to all of the ‘DEPLORABLES’ and the millions of people who gave us a MASSIVE (304-227) Electoral College landslide victory!” Trump tweeted, along with a photo of him and advisers giving a thumbs up.

This isn’t the first time critics have described Trump as “insecure.”

Shortly after taking office, the Wall Street Journal editorial board slammed Trump for appearing “small and insecure” while bragging about the size of the crowd at his inauguration at the Central Intelligence Agency.